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Xeriscape Plants Ornamentals and Flowers Mar. 2008 OF-42 Xeriscape Plants Melvin Wong Department of Tropical Plant and Soil Sciences ecause most of Hawai‘i’s hotels, shopping centers, development of a deep root system and decreased fertil- office buildings, and residences are located on the izer levels. dry,B hot leeward sides of the islands, many of their land- Many xeriscape plants are hardy and drought toler- scape plants are xeriscape plants, even though irrigation ant but not necessarily attractive. Examples are milo, is usually available. Xeriscape plants include most of the neem, gular, Java plum, kiawe, yellow poinciana, silver coastal native plants and beach plants. oak, looking glass, chinaberry, mahogany, octopus, date Rainforest plants suffer in hot, dry weather. In similar palm, ironwood, hau, and wiliwili (trees), and beach fashion, xeriscape plants may often suffer in wet condi- naupaka, blue vitex, oleander, cardboard palm, Indian tions. For example, mock orange is very vulnerable to hawthorn, and yeddo hawthorn (shrubs). Other xeri- root rot in poorly drained soil or landscapes with exces- scape plants are attractive or have unique and desirable sive irrigation. features with different degrees of drought tolerances. The landscape committee of a Kāhala condominium Examples of such trees are California pepper, weeping was not satisfied with the maintenance of their facility red bottlebrush, karum, variegated Chinese banyan, white and recommended to their grounds foreman to increase opiuma, Formosan koa, Cook or Norfolk pines, rainbow the irrigation. The foreman did just that and succeeded shower, coconut, lignum vitae, St. Thomas orchid, silver in causing root rot to mock orange, Natal plum, and buttonwood, calabash, Australian tea, blue latan palm, privet. Canary Island date palm, dwarf date palm, plumeria, Enchanted Lake has a heavy clay soil that does not silver tecoma, queen palm, gold tree, autograph, true and dry out quickly once wet. As this is a dry area where false kamani, mahagoni, tamarind, and Madagascar olive. frequent watering is necessary, hibiscus, croton, Natal Examples of shrubs are Raspberry Ice bougainvillea, plum, privet, and mock orange suffer from root rot in a Hula Girl hibiscus, spider lily, daylily, enchantress haw- similar fashion. Amending the soil is not cost effective. thorn, candlebush, Cape honeysuckle, dwarf poinciana, But even with this difficult soil, beach naupaka grew stephanotis, sandpaper vine, allamanda, purple bignonia well and looked good. Therefore, I recommended that vine, mandevilla, yellow mandevilla vine, Japanese susceptible shrubs be replaced with beach naupaka. honeysuckle, orange blanchetiana bromeliad, variegated Several succulent ground covers, such as hottentot pineapple, and Texas Ranger. fig, ice plant, hearts and flowers, and bacopa suffer from Finding effective and attractive ground covers with Rhizoctonia even when watered normally. The xeriscape drought tolerance is not easy. My preferences are African ground covers of Madagascar periwinkle and dwarf lily, Madagascar periwinkle, the green form of spider oyster plant will be damaged from Phytophthora foliar plant, false heather, trailing lantana, bird nest sanseviera, rot if the foliage is wet by the irrigation system. and beach vitex. Many drought tolerant vines can also be Salinity damage can be a problem during hot, dry added to this list of ground covers. In the future, when conditions if irrigation is not adequate. Developing a water becomes scarce, brackish water may be required deep root system by watering deeply and not allowing for landscape uses. Therefore, xeriscape plants with salt the lower soil layers to dry out is extra insurance against tolerance will become important. The following lists of salinity damage. Therefore, proper irrigation is impor- plants is provided to help you choose xeriscape plants. tant in hot, dry weather to avoid root and foliar rot with It is not a complete list. You may add or delete as you excessive watering and to avoid salinity damage through choose. Published by the College of Tropical Agriculture and Human Resources (CTAHR) and issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in coopera- tion with the U.S. Department of Agriculture. Andrew G. Hashimoto, Director/Dean, Cooperative Extension Service/CTAHR, University of Hawai‘i at Mänoa, Honolulu, Hawai‘i 96822. An equal opportunity/affirmative action institution providing programs and services to the people of Hawai‘i without regard to race, sex, age, religion, color, national origin, ancestry, dis- ability, marital status, arrest and court record, sexual orientation, or status as a covered veteran. CTAHR publications can be found on the Web site <http://www.ctahr.hawaii.edu/freepubs>. UH–CTAHR Xeriscape Plants OF-42 — Mar. 2008 Trees Acacia confusa ...................................................................................................................................... Formosan koa Bauhinia binata Bauhinia blakeana ......................................................................................................................... Hong Kong orchid Bauhinia monandra ........................................................................................................................St. Thomas orchid Bauhinia variegata Bucida buceras .............................................................................................................................................geometry Callistemon citrinus .............................................................................................................. weeping red bottlebrush Cassia x Nealiae ‘Wilhelmina Tenny’ Casuarina equisetifolia .................................................................................................................................ironwood Catalpa longissima .................................................................................................................................... yoke-wood Cerbera manghas .............................................................................................................................................cerbera Clusia rosea .................................................................................................................................................autograph Crescentia cujete ............................................................................................................................................ calabash Enterolobium cyclocarpum ...............................................................................................................................earpod Guaiacum officinale ................................................................................................................................lignum vitae Gymnostoma papuanum Hypphorbe lagenicaulis .............................................................................................................................bottle palm Mimusops caffra Mimusops elengi .............................................................................................................................................. pogada Olea europaea subsp. Europaea .......................................................................................................................... oliva Peltopohorum pterocarpum ..............................................................................................................yellow poinciana Phoenix canariensis ..............................................................................................................Canary Island date palm Pimenta dioica .................................................................................................................................................allspice Pithecellobium dulce ‘Variegata’ ........................................................................................................... white opiuma Plumeria rubra ...............................................................................................................................................plumeria Pongamia pinnata ............................................................................................................................................. karum Prosopis pallida ................................................................................................................................................. kiawe Pterocarpus indicus ............................................................................................................................................ narra Schinus molle ...................................................................................................................................California pepper Schinus terebinthifolius .......................................................................................................................Christmasberry Sterculia foetida ..........................................................................................................................................Java olives Sterculia urens .................................................................................................................................................... gular Swietenia mahagoni .................................................................................................................................... mahogany Thevetia peruviana ...........................................................................................................................................be-still
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